Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 127gr | RWS Evolution Green bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Power Pro 2000-MR.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 58,291 psi | 90% | 2986 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,913 psi | 88% | 3015 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,840 psi | 87% | 3005 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,361 psi | 85% | 3028 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,507 psi | 87% | 3009 fps | 96.8% |
| Accurate 4064 | <<locked>> | 92% | 56,753 psi | 87% | 3054 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 3146 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 57,754 psi | 89% | 3097 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,201 psi | 85% | 3038 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,637 psi | 87% | 3045 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,725 psi | 89% | 3018 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 58,784 psi | 90% | 3163 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 58,001 psi | 89% | 3228 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,100 psi | 85% | 3061 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,928 psi | 89% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,695 psi | 86% | 3084 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,085 psi | 85% | 3153 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,463 psi | 87% | 3192 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,986 psi | 60% | 2854 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,918 psi | 68% | 3025 fps | 97.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,899 psi | 89% | 3114 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 55,811 psi | 86% | 3077 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,941 psi | 86% | 3041 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 86% | 58,218 psi | 90% | 3025 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,188 psi | 86% | 3074 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 58,624 psi | 90% | 3186 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 57,246 psi | 88% | 3038 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 58,407 psi | 90% | 3064 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,985 psi | 88% | 3094 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 56,681 psi | 87% | 3143 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 96% | 57,464 psi | 88% | 3107 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 58,378 psi | 90% | 3107 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,169 psi | 79% | 3018 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 58,117 psi | 89% | 3143 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 58,059 psi | 89% | 3189 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 54% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,057 psi | 86% | 3058 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 58,218 psi | 90% | 3087 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 58,175 psi | 89% | 3074 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 58,450 psi | 90% | 3061 fps | 97.9% |
| IMR 4198 | <<locked>> | 82% | 57,725 psi | 89% | 2946 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,521 psi | 87% | 3071 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 58,131 psi | 89% | 3081 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,157 psi | 83% | 3077 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 57,130 psi | 88% | 3117 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,637 psi | 87% | 3045 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,884 psi | 88% | 3028 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,421 psi | 88% | 3068 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,203 psi | 88% | 3022 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 58,059 psi | 89% | 3074 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,290 psi | 88% | 3071 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 58,450 psi | 90% | 3110 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 56,304 psi | 87% | 3038 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,797 psi | 87% | 3035 fps | 100% |
| Norma 203B | <<locked>> | 92% | 58,595 psi | 90% | 3127 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,406 psi | 88% | 3123 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 56,492 psi | 87% | 3133 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 55,883 psi | 86% | 3100 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,259 psi | 85% | 3127 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 57,014 psi | 88% | 3061 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,623 psi | 87% | 3081 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,551 psi | 89% | 3045 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,752 psi | 55% | 1929 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,014 psi | 86% | 3025 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,392 psi | 88% | 3074 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,623 psi | 87% | 3159 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,260 psi | 87% | 3192 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,421 psi | 88% | 3173 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,058 psi | 88% | 3202 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 56,869 psi | 87% | 3018 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,768 psi | 87% | 3035 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,666 psi | 86% | 3068 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,941 psi | 86% | 3041 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,290 psi | 88% | 3071 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,421 psi | 88% | 3068 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 58,059 psi | 89% | 3074 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 58,450 psi | 90% | 3110 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,885 psi | 89% | 3136 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,550 psi | 85% | 3038 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,318 psi | 87% | 3068 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,957 psi | 89% | 2976 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 58,247 psi | 90% | 2969 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,609 psi | 89% | 3018 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 58,189 psi | 90% | 3081 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,232 psi | 88% | 2972 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,042 psi | 85% | 3028 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 55,985 psi | 86% | 3068 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,734 psi | 78% | 3077 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 57,551 psi | 89% | 2936 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 58,175 psi | 89% | 2959 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,579 psi | 87% | 2999 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,638 psi | 89% | 3015 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,551 psi | 89% | 3041 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,274 psi | 85% | 3071 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 57,421 psi | 88% | 3048 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,753 psi | 86% | 3012 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 58,160 psi | 89% | 3136 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,685 psi | 66% | 2933 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,927 psi | 86% | 3054 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,522 psi | 88% | 3097 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,014 psi | 88% | 3150 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,882 psi | 54% | 2841 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,260 psi | 87% | 3074 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 48,370 psi | 74% | 2841 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,953 psi | 81% | 2956 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,611 psi | 62% | 2746 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,022 psi | 74% | 2913 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,516 psi | 76% | 2890 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,435 psi | 59% | 2736 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,449 psi | 58% | 2776 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 44,614 psi | 69% | 2867 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,840 psi | 58% | 2703 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,775 psi | 72% | 2881 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 47,152 psi | 73% | 2871 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 54,911 psi | 84% | 3104 fps | 100% |
| Alliant Power Pro 2000-MR | 49.8 gr | 80% | 40,524 psi | 62% | 2887 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,362 psi | 57% | 2723 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,143 psi | 83% | 2940 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,248 psi | 62% | 2792 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,186 psi | 54% | 2730 fps | 95% |
| Alliant Reloder-17 | 49.1 gr | 80% | 32,314 psi | 50% | 2677 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,242 psi | 50% | 2674 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,000 psi | 58% | 2881 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,092 psi | 68% | 2871 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 36,956 psi | 57% | 2723 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 49,226 psi | 76% | 2927 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,486 psi | 75% | 2871 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,513 psi | 70% | 2897 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,604 psi | 78% | 3054 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 53,490 psi | 82% | 2982 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 54,708 psi | 84% | 3009 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,884 psi | 58% | 2726 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 92% | 46,180 psi | 71% | 2956 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 50,328 psi | 77% | 2986 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 45,020 psi | 69% | 2881 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,242 psi | 50% | 2618 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,162 psi | 63% | 2844 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 50,024 psi | 77% | 3048 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,266 psi | 40% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,149 psi | 66% | 2825 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 44,657 psi | 69% | 2874 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,682 psi | 61% | 2740 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 82% | 45,078 psi | 69% | 2822 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 54,549 psi | 84% | 2904 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 49,516 psi | 76% | 2953 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,310 psi | 70% | 2854 fps | 95% |
| IMR 4831 | <<locked>> | 88% | 36,100 psi | 56% | 2723 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,278 psi | 64% | 2825 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 46,775 psi | 72% | 2881 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 52,910 psi | 81% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,642 psi | 67% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,556 psi | 69% | 2802 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 39,523 psi | 61% | 2743 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 41,916 psi | 64% | 2789 fps | 95.7% |
| Lovex S070 | <<locked>> | 92% | 45,034 psi | 69% | 2874 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,540 psi | 67% | 2815 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 43,859 psi | 67% | 2825 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,639 psi | 61% | 2779 fps | 97.8% |
| Norma 204 | <<locked>> | 98% | 53,577 psi | 82% | 3061 fps | 95.1% |
| Norma URP | <<locked>> | 88% | 37,695 psi | 58% | 2776 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,204 psi | 60% | 2789 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 42,279 psi | 65% | 2884 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 46,818 psi | 72% | 2884 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,253 psi | 71% | 2904 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,401 psi | 78% | 2930 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 41% | 1726 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,417 psi | 81% | 2969 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,888 psi | 68% | 2835 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,482 psi | 65% | 2900 fps | 97.9% |
| ReloadSwiss RS 60 | 49.1 gr | 80% | 34,490 psi | 53% | 2756 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,217 psi | 57% | 2789 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,205 psi | 62% | 2867 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 47,442 psi | 73% | 2864 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,321 psi | 64% | 2762 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 34,737 psi | 53% | 2664 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 49,226 psi | 76% | 2927 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,916 psi | 64% | 2789 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,642 psi | 67% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,523 psi | 61% | 2743 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 92% | 45,034 psi | 69% | 2874 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,853 psi | 55% | 2717 fps | 96.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,904 psi | 69% | 2851 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,105 psi | 66% | 2831 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,078 psi | 69% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,463 psi | 58% | 2631 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,268 psi | 73% | 2844 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 50,807 psi | 78% | 2963 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,570 psi | 69% | 2772 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,860 psi | 69% | 2854 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 35,665 psi | 55% | 2674 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 27,456 psi | 42% | 2533 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 50,952 psi | 78% | 2841 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,484 psi | 70% | 2769 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,017 psi | 63% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,684 psi | 64% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,895 psi | 52% | 2608 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 36,898 psi | 57% | 2723 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 46,847 psi | 72% | 2874 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,059 psi | 62% | 2743 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,318 psi | 56% | 2720 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 34,824 psi | 54% | 2756 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,168 psi | 46% | 2520 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 46,659 psi | 72% | 2923 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 46,470 psi | 71% | 2963 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,501 psi | 47% | 2694 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,569 psi | 65% | 2835 fps | 98.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 119 powders for .280 Ackley Improved loaded with the .284 | 127gr | RWS Evolution Green. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,228 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,228 fps. Accurate 3100 gives the best case fill at 100 %, and 119 of the 119 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 127.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .280 Ackley Improved with the .284 | 127gr | RWS Evolution Green they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.